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You can download the individual applications (e.g., Word, Excel, etc) that make up Microsoft Office. Open your App Store app on the iPad and search for Microsoft.

While you can download the apps for free you do not get a free Office 365 subscription

Note the following from https://itunes.apple.com/us/app/microsoft-word/id586447913?mt=8

To create or edit documents, sign in with a free Microsoft account on devices with a screen size smaller than 10.1 inches.

Unlock the full Microsoft Office experience with a qualifying Office 365 subscription (see http://aka.ms/Office365subscriptions) for your phone, tablet, PC, and Mac.

Office 365 subscriptions purchased from the app will be charged to your App Store account and will automatically renew within 24 hours prior to the end of the current subscription period unless auto-renewal is disabled beforehand. You can manage your

subscriptions in your App Store account settings.